Bullwinkle...
In the real world, the US government would never default on its obligations. Long before such a drastic measure would be taken, they would instead drive the value of the currency down so low that repayment in "real" value would be cents on the dollar so the debt burden would be far less than it now appears.
Of course, that would create its own set of problems, but those hurt the worst would be the owners of the debt - the bondholders. The big winners would be those folks wise enough to own "things" instead of fiat money - real estate, gold, and other long term assets.
mlsoft